Human factors (HF) is the interaction between workers, equipment, and the environment. The COVID-19 pandemic has accelerated the adoption of HF in intensive care units across the globe. This paper expands on the core concepts of HF and proposes the additional key concepts of agility, serendipity, innovation, and learning. Adoption of these HF concepts by leadership and staff can improve patient safety in intensive care units in future pandemics and other crisis situations.